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/* $Id$ */
#include <stdio.h>
#include <erl_driver.h>
#include <ei.h>
#include <iconv.h>
#include "uni_data.c"
typedef struct {
ErlDrvPort port;
} stringprep_data;
static ErlDrvData stringprep_erl_start(ErlDrvPort port, char *buff)
{
stringprep_data* d = (stringprep_data*)driver_alloc(sizeof(stringprep_data));
d->port = port;
set_port_control_flags(port, PORT_CONTROL_FLAG_BINARY);
return (ErlDrvData)d;
}
static void stringprep_erl_stop(ErlDrvData handle)
{
driver_free((char*)handle);
}
static int stringprep_erl_control(ErlDrvData drv_data,
unsigned int command,
char *buf, int len,
char **rbuf, int rlen)
{
int i, j=0;
unsigned char c;
int bad = 0;
int uc, ruc;
int size;
int info;
ErlDrvBinary *b;
char *rstring;
size = len;
rstring = malloc(size);
for(i=0; i < len; i++)
{
c = buf[i];
if(c < 0x80) {
uc = c;
} else if(c < 0xC0) {
bad = 1;
} else if(c < 0xE0) {
if(i+1 < len && (buf[i+1] & 0xC0) == 0x80) {
uc = ((c & 0x1F) << 6) | (buf[i+1] & 0x3F);
i++;
} else {
bad = 1;
}
} else if(c < 0xF0) {
if(i+2 < len && (buf[i+1] & 0xC0) == 0x80 &&
(buf[i+2] & 0xC0) == 0x80) {
uc = ((c & 0x1F) << 12) | ((buf[i+1] & 0x1F) << 6)
| (buf[i+2] & 0x3F);
i += 2;
} else {
bad = 1;
}
} else {
// TODO
bad = 1;
}
if(bad) {
*rbuf = (char*)(b = driver_alloc_binary(1));
b->orig_bytes[0] = 0;
free(rstring);
return 1;
}
info = GetUniCharInfo(uc);
ruc = uc + GetDelta(info);
if(ruc < 0x80) {
if(j >= size) {
size = 2*size + 1;
rstring = realloc(rstring, size);
}
rstring[j] = (char) ruc;
j++;
} else if(ruc < 0x7FF) {
if(j >= size) {
size = 2*size + 2;
rstring = realloc(rstring, size);
}
rstring[j] = (char) ((ruc >> 6) | 0xC0);
rstring[j+1] = (char) ((ruc | 0x80) & 0xBF);
j += 2;
} else if(ruc < 0xFFFF) {
if(j >= size) {
size = 2*size + 3;
rstring = realloc(rstring, size);
}
rstring[j] = (char) ((ruc >> 12) | 0xE0);
rstring[j+1] = (char) (((ruc >> 6) | 0x80) & 0xBF);
rstring[j+2] = (char) ((ruc | 0x80) & 0xBF);
j += 3;
}
}
*rbuf = (char*)(b = driver_alloc_binary(j));
memcpy(b->orig_bytes, rstring, j);
free(rstring);
return j;
}
ErlDrvEntry stringprep_driver_entry = {
NULL, /* F_PTR init, N/A */
stringprep_erl_start, /* L_PTR start, called when port is opened */
stringprep_erl_stop, /* F_PTR stop, called when port is closed */
NULL, /* F_PTR output, called when erlang has sent */
NULL, /* F_PTR ready_input, called when input descriptor ready */
NULL, /* F_PTR ready_output, called when output descriptor ready */
"stringprep_drv", /* char *driver_name, the argument to open_port */
NULL, /* F_PTR finish, called when unloaded */
NULL, /* handle */
stringprep_erl_control, /* F_PTR control, port_command callback */
NULL, /* F_PTR timeout, reserved */
NULL /* F_PTR outputv, reserved */
};
#ifdef WIN32
__declspec(dllexport)
#endif
DRIVER_INIT(stringprep_erl) /* must match name in driver_entry */
{
return &stringprep_driver_entry;
}
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